UCC28951 Phase-shifted full-bridge controller for wide input voltage range | TI.com

UCC28951 (ACTIVE) Phase-shifted full-bridge controller for wide input voltage range

 

Description

The UCC28951 device is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. Refer to application note SLUA853 to determine which controller to use. The UCC28951 uses advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

The UCC28951 has many light-load management features including burst-mode operation and dynamic SR ON and OFF control during transition into and out of discontinuous current mode (DCM) operation. The device operates in current-mode or voltage-mode control. The switching frequency can be programmed up to 1 MHz. The device has protection features including cycle-by-cycle current limit, UVLO, and thermal shutdown.

The 24-pin, TSSOP package complies with RoHS requirements .

Features

  • Enhanced Zero-Voltage Switching (ZVS) Range
  • Direct Synchronous Rectifier (SR) Control
  • Light-Load Efficiency Management Including:
    • Burst Mode Operation
    • Discontinuous Conduction Mode (DCM), Dynamic SR On/Off Control With Programmable Threshold
    • Programmable Adaptive Delay
  • Average- or Peak-Current Mode Control With Programmable Slope Compensation and Voltage-Mode Control
  • Closed-Loop Soft-Start and Enable Function
  • Programmable Switching Frequency up to 1 MHz With Bidirectional Synchronization
  • (±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support
  • 150-µA Start-Up Current
  • VDD Undervoltage Lockout
  • Wide Temperature Range: –40°C to +125°C

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WEBENCH® Designer UCC28951

  Min   Max Range
Vin  V 15.0 to 2000.0V
Vout  V 3.3 to 50V
Iout  A ≤ 300A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UCC28951 Order now Phase-Shifted Full-Bridge     Current
Peak Current Mode
Voltage    
8     17     1000     7.3/6.7     97     0.2     Adjustable Switching Frequency
Current Limiting
Enable/Shutdown
Error Amplifier
Green Mode
Light Load Efficiency
Programmable Slope Compensation
Soft Start
Soft Switching
Synchronization Pin
Thermal Shutdown    
Catalog     -40 to 125     TSSOP | 24     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)    
LM5046 Order now Phase-Shifted Full-Bridge     Current
Voltage    
10     14     1000     Programmable/1.25V     100     1.5
2    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
HV Start-up
SR Logic
Soft Start
Soft Switching    
Catalog     -40 to 125     HTSSOP | 28
WQFN | 28    
28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)
28WQFN: 25 mm2: 5 x 5 (WQFN | 28)    
UCC2895 Order now Phase-Shifted Full-Bridge     Current
Feedforward
Voltage    
10     16.5     1000     11/9     100     0.1     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Catalog     -40 to 85     PDIP | 20
SOIC | 20
TSSOP | 20    
20PDIP: 229 mm2: 9.4 x 24.33 (PDIP | 20)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
UCC28950 Order now Phase-Shifted Full-Bridge     Current
Voltage    
8     17     1000     7.3/6.75     95     0.2     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Light Load Efficiency
Multi-topology
SR Logic
Soft Start
Soft Switching
Synchronization Pin    
Catalog     -40 to 125     TSSOP | 24     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)    
UCC3895 Order now Phase-Shifted Full-Bridge     Current
Feedforward
Voltage    
10     16.5     1000     11/9     100     0.1     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Catalog     0 to 70     PDIP | 20
SOIC | 20
TSSOP | 20    
20PDIP: 229 mm2: 9.4 x 24.33 (PDIP | 20)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)